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Herdérite
- Translations : Herderite, Allogonit, Glucinit, Herderita, Гердерит, 磷铍钙石, ヘルデライト
- Synonym : Allogonite, Glucinite
- Etymology : Gem dedicated to Baron Siegmund A.W. VON HERDER, officer of the mines of Freiberg (1776-1838 ) in Germany. Discovered in 1828 in Ehrenfriedersdorf, Saxony, Germany.
- Discovery: 1828 by Wilhelm Haidinger
- Type localitySauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxe, Germany
Gemological data
- Chemical formula : CaBePO4(F,OH)
- Hardness (Mohs) : 5 - 5.5
- Density : 2.95 - 3.01
- Refractive index : nα = 1.556 - 1.592 nβ = 1.578 - 1.610 nγ = 1.589 - 1.620
- Birefingence : 1.59 - 1.62
- Crystal system : Monoclinic
- Group : Gadolinite
- Mineralogical Class : Phosphates
The gallery
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- Herdérite – Herderite
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- HERD0002
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- HERD0003
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- HERD0004
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- HERD0005
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- HERD0006
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- HERD0007
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- HERD0008
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- HERD0009
